Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb6e97de015f440…

MALICIOUS

PDF

91.2 KB Created: 2021-06-17 07:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ae0c8a4502f501d8dc7411229661ce SHA-1: 38e107ff1a2871a34d2fa73250f40155ba9832a4 SHA-256: 4eb6e97de015f440dfd1680c45567ed8de135fb4085800b054dc779739df5d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to facilitate the download of malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=gta+v+download+for+android+without+verification
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084a38461610---kasik.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/bixesixazefirimikebuga.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e91d069f---41426786026.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b22ab7d116da66c84eb99487f2827ef4/todolaletedosanozani.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e0d99720---joruxokarixubuk.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c9de77d0---zobefu.pdf
    • http://www.aluvascientific.com/UserFiles/file/14219258479.pdf
    • http://bearings-home.com/userfiles/file/52918574559.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b09e27e1e---mubakanovu.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/30257486873.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/554a0770d075338b12ca7d22ce5f777b/minutijerotakeguxukazi.pdf
    • https://noihoithanhtuan.com/media/ftp/file/84971913035.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/26486114662.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72f2cb346---bojuduwerepinugiruwaf.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c9c2c21f77f7181ae1848250b46b7e0c/lukozifalavenogid.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/21805cb50902b2c2de108a37ad2004f8/tudikalokagux.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cva8f0e2df9ma6a02pl4ubchp6/jodam.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t6evgbbaqqsv99t7jmcvjmu7a2/76811860360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011caa.bin
b85587e3bcd6d97c4a87eed692f53f9a7bef64fa98afd938afae5e5de5eb71d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 5112 bytes
font_01_sfnt_off00012e27.bin
2d3a988d05cfd2bbc83a06da816f5fc967e4787aa21abb4a97bb8c083d7f6731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E27 20500 bytes

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